skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Accurate nucleon electromagnetic form factors from dispersively improved chiral effective field theory

Abstract

We present a theoretical parametrization of the nucleon electromagnetic form factors (FFs) based on a combination of chiral effective field theory and dispersion analysis. The isovector spectral functions on the two-pion cut are computed using elastic unitarity, chiral pion-nucleon amplitudes, and timelike pion FF data. Higher-mass isovector and isoscalar t-channel states are described by effective poles, whose strength is fixed by sum rules (charges, radii). Excellent agreement with the spacelike proton and neutron FF data is achieved up to $$Q^2 \sim$$ 1 $GeV^2$. Here, our parametrization provides proper analyticity and theoretical uncertainty estimates and can be used for low-$Q^2$ FF studies and proton radius extraction.

Authors:
ORCiD logo;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1464272
Alternate Identifier(s):
OSTI ID: 1469112
Report Number(s):
JLAB-THY-18-2675; DOE/OR/-23177-4402; arXiv:1803.09748
Journal ID: ISSN 0370-2693; S0370269318306154; PII: S0370269318306154
Grant/Contract Number:  
AC05-06OR23177; FPA2016-77313-P; FPA2016-75654-C2-2-P
Resource Type:
Published Article
Journal Name:
Physics Letters B
Additional Journal Information:
Journal Name: Physics Letters B Journal Volume: 784 Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Nucleon form factors; Proton radius puzzle; Dispersion relations; Chiral effective field theory

Citation Formats

Alarcón, J. M., and Weiss, C. Accurate nucleon electromagnetic form factors from dispersively improved chiral effective field theory. Netherlands: N. p., 2018. Web. https://doi.org/10.1016/j.physletb.2018.07.060.
Alarcón, J. M., & Weiss, C. Accurate nucleon electromagnetic form factors from dispersively improved chiral effective field theory. Netherlands. https://doi.org/10.1016/j.physletb.2018.07.060
Alarcón, J. M., and Weiss, C. Sat . "Accurate nucleon electromagnetic form factors from dispersively improved chiral effective field theory". Netherlands. https://doi.org/10.1016/j.physletb.2018.07.060.
@article{osti_1464272,
title = {Accurate nucleon electromagnetic form factors from dispersively improved chiral effective field theory},
author = {Alarcón, J. M. and Weiss, C.},
abstractNote = {We present a theoretical parametrization of the nucleon electromagnetic form factors (FFs) based on a combination of chiral effective field theory and dispersion analysis. The isovector spectral functions on the two-pion cut are computed using elastic unitarity, chiral pion-nucleon amplitudes, and timelike pion FF data. Higher-mass isovector and isoscalar t-channel states are described by effective poles, whose strength is fixed by sum rules (charges, radii). Excellent agreement with the spacelike proton and neutron FF data is achieved up to $Q^2 \sim$ 1 $GeV^2$. Here, our parametrization provides proper analyticity and theoretical uncertainty estimates and can be used for low-$Q^2$ FF studies and proton radius extraction.},
doi = {10.1016/j.physletb.2018.07.060},
journal = {Physics Letters B},
number = C,
volume = 784,
place = {Netherlands},
year = {2018},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1016/j.physletb.2018.07.060

Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

Save / Share:

Works referencing / citing this record:

Electromagnetic form factors of the transition from the spin-3/2 Σ to the Λ hyperon
journal, January 2020


Proton charge radius extraction from electron scattering data using dispersively improved chiral effective field theory
journal, April 2019


Reexamining the proton-radius problem using constrained Gaussian processes
journal, May 2019


Nucleon form factors and root-mean-square radii on a ( 10.8 fm ) 4 lattice at the physical point
journal, January 2019


Hadrons and nuclei
journal, November 2019

  • Detmold, William; Edwards, Robert G.; Dudek, Jozef J.
  • The European Physical Journal A, Vol. 55, Issue 11
  • DOI: 10.1140/epja/i2019-12902-4